Phytoremediation Competence of Composite Heavy-Metal-Contaminated Sediments by Intercropping Myriophyllum spicatum L. with Two Species of Plants

Yidan Li, Yanyan Song, Jing Zhang and Yingxin Wan ()
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Yidan Li: College of Biochemical Engineering, Beijing Union University, Beijing 100023, China
Yanyan Song: College of Biochemical Engineering, Beijing Union University, Beijing 100023, China
Jing Zhang: College of Biochemical Engineering, Beijing Union University, Beijing 100023, China
Yingxin Wan: College of Biochemical Engineering, Beijing Union University, Beijing 100023, China

IJERPH, 2023, vol. 20, issue 4, 1-12

Abstract: A variety of remediation approaches have been applied to reduce the harm and diffusion of heavy metals in aquatic sediments; however, phytoremediation in co-contaminated soils is still not clear. In order to explore the phytoremediation of sediments contaminated by Cu and Pb, two submerged plants with different characteristics, Vallisneria natans and Hydrilla verticillata , were interplanted with Myriophyllum spicatum . By simulating a submerged plant ecological environment, medium-scale-simulated ecological remediation experiments were carried out. The results showed that the two planting patterns were effective in repairing the sediments in the Cu and Pb contaminated sediments. The intercropping of Myriophyllum spicatum and Vallisneria natans can be used as the plant stabilizer of Cu because of the TF > 1 and BCF < 1, and the intercropping with Hydrilla verticillata can regulate the enrichment efficiency of Myriophyllum spicatum . The removal rates of Cu and Pb in sediments reached 26.1% and 68.4%, respectively, under the two planting patterns. The risk grade of the restored sediments was RI < 150, indicating a low risk.

Keywords: submerged plant; Myriophyllum spicatum L.; translocation; phytoremediation; sediment; intercropping (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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